Sweden-based Eurocon and MoRe Research are cooperating to offer analysis, mapping, and system design for collection and destruction of European pulp mills’ diluted non-condensable gases. For pulp mills, this means a complete and simplified project process.

The need for a cost efficient way of collection and destruction of diluted non-condensable gases (DNCG has increased due to tougher EU demands forcing the industry to use best available technology (BAT). According to EU directive 2010/75/EU, the requirements of the BAT conclusions must be met by Sept. 30, 2018. All pulp mills must identify and quantify the emissions of DNCG and report how the requirements are followed or the plan how to follow them.  

"What we usually call weak odorous gases are diluted total reduced sulpfur gases containing a mixture of different sulfurous substances such as hydrogen sulfide, methylmercaptan, dimethylsulfide (DMS), and dimethyldisulfide (DMDS)," said Michael Sjögren, project engineer, MoRe Research. "The pulp mills can reduce the emission of malodorous gases by collecting the different emissions, e.g. at the recovery boiler, for combustion. However, to be able to dimension a plant for this, the size and composition of the gas streams must be determined and mapped." 

In the photo above, MoRe and Eurocon have developed flow measurement methods as well as analyses of sulfur content in the pulp mills' DNCG gases and also design of a technical solution.

"These diluted non-condensable gases, DNCG, are released from, for example, tanks, washing filters, chip bins, lime mud filters, or drying machines. Together with Eurocon, we have therefore developed flow measurement methods as well as analyses of sulfur content in the pulp mills' DNCG. Based on the analysis results, Eurocon dimensions, designs, and constructs a technical solution for an efficient gas collection for immediate destruction," Sjögren explained.

"We have more than 50 years of collective experience within the non-condensable gases area, NCG," said Lars-Eric Myrman, manager, Process, Eurocon. "This includes concentrated non-condensable gases, CNCG, as well as diluted non-condensable gases, DNCG. The pipe construction for these aggressive gases differs considerably from traditional pipe construction. In the case of NCG, the gases are moist, poisonous, and explosive, which puts demands on special competence regarding construction of piping for gas collecting systems." 

"It is unique that a complete concept for analysis and design of a technical solution is offered. Without a reliable set of analysis data, an efficient system cannot be designed, and now we can together offer a complete package. This is possible due to close cooperation between Eurocon and MoRe," Myrman concluded.  

Thanks to the cooperation between Eurocon Engineering and the Swedish company MISTAB, the latter can offer deliveries of individually designed equipment to customers.

MoRe Research is a neutral and independent research and development company in the field of product and process development, mainly for the pulp and paper industry. MoRe Research is based in Örnsköldsvik, Sweden. More information is available online.

Eurocon has approximately 200 experienced and competent employees within technology development and with the capacity to challenge also the largest and most renowned forest, energy, mining, chemistry, and engineering players. Eurocon is located in Kiruna, Örnsköldsvik, Härnösand, Sundsvall, Stockholm, Gothenburg, Växjö, and Karlshamn in Sweden.